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When I start ipython, the following error gets printed in the screen:

[TerminalIPythonApp] ERROR | Exception while loading config file /home/cossio/.ipython/profile_default/ipython_config.py

Traceback (most recent call last):

File "/usr/lib/python2.7/dist-packages/IPython/config/application.py", line 514, in _load_config_files config = loader.load_config()

File "/usr/lib/python2.7/dist-packages/IPython/config/loader.py", line 425, in load_config self._read_file_as_dict()

File "/usr/lib/python2.7/dist-packages/IPython/config/loader.py", line 478, in _read_file_as_dict py3compat.execfile(conf_filename, namespace)

File "/usr/lib/python2.7/dist-packages/IPython/utils/py3compat.py", line 224, in execfile builtin_mod.execfile(filename, *where)

File "/home/cossio/.ipython/profile_default/ipython_config.py", line 535, in

IPythonWidget.buffer_size=999999 NameError: name 'IPythonWidget' is not defined

In spite of this, ipython starts, and I can use it. But I don't know what is the cause of this error?

I am using Xubuntu 15.04, Python 2.7.9, and IPython 2.3.0.

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